Id do the Sundowns since you have 1500 rms to play with.
Im about to do a new setup and im considering 4 AT Strato 10"s at this moment. Nice little cheap subs.
10 Coupe 5sp
Pioneer 80prs/2 Tantric SHD 21"s WALLED/5 90AH batteries/DC power 270XP Alt/Taramps T20.2kw/DSP3000/DSP1600/TS800x4/4 Crescendo UN-10"s/2 FT1 tweets
Projector retrofit with 50 watt morimoto.